This study investigated the effect of VDT vertical position on operator's performance and comfort. Three VDT positions (center of the screen) were studied: eye level, 250 mm above eye level, and 250 mm below eye level. At each VDT position, subjects worked with the computer continuously for 35 minutes. Typing speed (words per minute) and accuracy were recorded. A questionnaire about physical discomfort was answered by each subject after the trial at each VDT position. The result indicates that placing the center of the VDT at eye level is more comfortable.
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